America Revealed: Nation On The Move7.50pm, PBS

Presenter Yul Kwon examines the various networks that operate like the blood circulation of the US, meeting the operatives who keep the systems going, as well as commuters such as a rather unwell-looking salesman who travels thousands of miles each week by plane. However, as the programme makes clear, America's transport networks are in dire need of renewal, which, in an era of hostility to public spending, presents a challenge. David Stubbs

Cherry Healey: How To Get A Life9pm, BBC3

This week, Healey giggles her way through a quest into modern life entitled Are We All Addicts? It's a groundbreaking investigative journey where she repeatedly shouts "Your trousers are on fire" at a crusty smoking a legal high, watches people enjoy laughing gas, and uses phrases like "dish the dirt". Very little "dirt" is "dished" though, as she mugs at the camera whenever anyone tries to say anything deep and meaningful, and seems too embarrassed when she tries to quiz Brendan and Lucy, who've been dropping pills from Ann Summers to perk up their love life. Hannah Verdier

The Strange Case Of The Law9pm, BBC4

Freedoms are won, not granted. Such is the subtext of the second episode in barrister Harry Potter's history of the English justice system. He focuses here on the 17th and 18th centuries when brave souls such as John Cooke – the lawyer who prosecuted Charles I and was hanged, drawn and quartered for his trouble post-Restoration – used the law to challenge the abuse of power. A documentary filled with remarkable stories, such as that of Leveller "Freeborn" John Lilburne, the victim of an early take on extraordinary rendition, who challenged being arbitrarily banged up by the Commonwealth authorities. Jonathan Wright

The Secret History Of Our Streets9pm, BBC2

The fourth instalment looking at how London has changed since Charles Booth mapped its social register in 1886 focuses on Portland Road in Notting Hill, a classic example of how an area can reverse its fortunes. Developers who built the road hoped to attract wealthy residents, but the presence of a nearby Gypsy camp ensured that part of the street became a slum, with multiple occupancies in each house. Those same homes are now worth millions. A fascinating piece of social history, especially the first-hand testimony to how the area has changed. Martin Skegg

The Killing10.35pm, Channel 4

This US version received a lot of stick for leaving its viewers dangling at the end of season one. As season two continues to ratchet up the tension, the decision to prolong the story makes greater sense: by focusing on the family, this show hasn't yet got as daft as the original did in its own second season. In tonight's episode, Sarah Linden's investigation with Holder continues, in spite of attempts by her superiors to wrest it from her control. As Sarah climbs higher in the casino, the closer she gets to the obligatory cliffhanger. John Robinson